bttv_I2CRead
msp = bttv_I2CRead(btv, I2C_ADDR_MSP3400, "MSP34xx");
vals[i],tmp,bttv_I2CRead(btv,0x1F,NULL));
rc=bttv_I2CRead(btv,(PX_I2C_PIC<<1),NULL);
extern int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for);